ELM-ART: An Intelligent Tutoring System on World Wide Web.
Designing for the Eye: Design Parameters for Dwell in Gaze Interaction
Intelligent Tutoring Systems
Penkar A.M.
Schwarz EW
Brusilovsky P
Lutteroth , C
Eyes only: Navigating hypertext with gaze
Arquitetura de Adaptação em Sistemas Hipermídia Adaptativos Educacionais
Pedagogical Agents on the Web.